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Generated remediation guidance and an executive summary. No account required.
Wasmtime is a standalone runtime for WebAssembly. Prior to version 2.0.2, there is a bug in Wasmtime's C API implementation where the definition of the `wasmtime_trap_code` does not match its declared signature in the `wasmtime/trap.h` header file. This discrepancy causes the function implementation to perform a 4-byte write into a 1-byte buffer provided by the caller. This can lead to three zero bytes being written beyond the 1-byte location provided by the caller. This bug has been patched and users should upgrade to Wasmtime 2.0.2. This bug can be worked around by providing a 4-byte buffer casted to a 1-byte buffer when calling `wasmtime_trap_code`. Users of the `wasmtime` crate are not affected by this issue, only users of the C API function `wasmtime_trap_code` are affected.
Cite this page
CVE-2022-39394. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2022-39394
Use CWE-787, Bytecodealliance vendor hub and Wasmtime product page to widen CVE-2022-39394 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-34987, CVE-2026-34971 and CVE-2026-34941 for nearby disclosures in the same product family.